<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=false">
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

    <style>
        html,
        body {
            height: 100%;
            margin: 0;
            padding: 0;
        }
        #app {
            background-color: red;
            height: 10%;
            padding: 10px;
            position:fixed;
            width: 100%;
            bottom:0px;
        }
    </style>
</head>

<body>
    <div id="app">
        {{ message }}
    </div>

    <script>
        var app = new Vue({
            el: '#app',
            data: {
                message: 'Hello Vue!'
            }
        })
    </script>
</body>

</html>